<template>
    <div class="login_container">
         <!-- 头像区域 -->
         <div class="login_box">
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
 <!-- 登录表单区 -->
 <el-form  :model="loginForm"  :rules="loginFormRules"  ref="loginFormRef"  label-width="0px" class="login_form">
    <!-- 用户名 -->
  <el-form-item prop="username">
    <el-input v-model="loginForm.username" prefix-icon="el-icon-s-custom"></el-input>
  </el-form-item>
   <!-- 密码 -->
  <el-form-item prop="password">
    <el-input v-model="loginForm.password" type="password" prefix-icon="el-icon-lock"></el-input>
  </el-form-item>
  <!-- 按钮 -->
  <el-form-item class="btns">
    <el-button type="primary" @click="login">登录</el-button>
    <el-button type="info" @click="resetLoginForm">重置</el-button>
  </el-form-item>
</el-form>
    </div>    
    </div>
</template>
<script>
export default {
data(){
    return {
        //这是登录表单的数据绑定对象
        loginForm:{
            username:'admin',
            password:'123456'
        },
        //这是表单的验证规则对象
        loginFormRules:{
            //验证用户名是否合法
            username:[
            { required: true, message: '请输入登录名称', trigger: 'blur' },
            { min: 3, max: 5, message: '长度在 3 到 5 个字符', trigger: 'blur' }
          ],
            //验证密码是否合法
            password:[
            { required: true, message: '请输入登录密码', trigger: 'blur' },
            { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
            ]
        }
       
    };
   
},
methods:{
    resetLoginForm(){
        // console.log(this);
        this.$refs.loginFormRef.resetFields();
    },
    login(){
        this.$refs.loginFormRef.validate(async valid => {
           if(!valid)return;
           const { data: res } =await this.$http.post("login",this.loginForm);
         console.log(res);
    if(res.meta.status !== 200)return this.$message.error('登录失败');
    this.$message.success('登录成功');
//1.将登录成功之后的token，保存到客户端的sessionStorage中
//   1.1项目中除了登录之外的其他API接口，必须在登录之后才能访问
  window.sessionStorage.setItem("token","res.data.token");
//    1.2token 只应在当前网站打开期间生效，所以讲 token保存在sessionStorage 中
 
//2.通过编程式导航跳转到后台主页，路由地址是 /home   
this.$router.push("/home");
        })
    }
    }
}
</script>
<style lang="less" scoped>
.login_container {
    background-color: #2b4b6b;
    height: 100%;
    .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    //让盒子居中显示
    position: absolute;
    left: 50%;
    top:50%;
    transform: translate(-50%,-50%);
    .avatar_box{
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        //box-shadow:x轴 y轴 模糊半径 颜色;
         box-shadow: 0 0 10px #ddd;
         position: absolute;
         left: 50%;
         transform: translate(-50% , -50%);
         background-color: #fff;
        img {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
    
}
.login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    //不会因为边框和填充的原因而超出预期的大小
    box-sizing: border-box;
}
.btns {
    display: flex;
    justify-content: flex-end;
}
}
</style>